perf evsel: Allow specifying a file to output in perf_evsel__print_ip
As this function will be used in 'perf trace'. Cc: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/n/tip-8x297v9utnxq77onikevvlse@git.kernel.org [ Split from a larger patch ] Signed-off-by: NMilian Wolff <milian.wolff@kdab.com>
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